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EXTENDING DREAMWEAVER CS4

C-level extensibility

JSBool JS_ValueToBoolean()

Description

This function extracts a function argument from a JSVal structure, converts it to a Boolean value (if possible), and

passes the converted value back to the caller.

Arguments

JSContext *cx, JSVal v, JSBool *bp

• The cx argument is the opaque JSContext pointer that passes to the JavaScript function.

• The v argument is the JSVal structure from which the Boolean value is to be extracted.

• The bp argument is a pointer to a JSBool Boolean value. This function stores the converted value in *bp.

Returns

A Boolean value: JS_TRUE indicates success; JS_FALSE indicates failure.

JSBool JS_ValueToObject()

Description

This function extracts a function argument from a JSVal structure, converts it to an object (if possible), and passes the

converted value back to the caller. If the object is an array, use

JS_GetArrayLength() and JS_GetElement() to read

its contents.

Arguments

JSContext *cx, JSVal v, JSObject **op

• The cx argument is the opaque JSContext pointer that passes to the JavaScript function.

• The v argument is the JSVal structure from which the object is to be extracted.

• The op argument is a pointer to a JSObject pointer. This function stores the converted value in *op.

Returns

A Boolean value: JS_TRUE indicates success; JS_FALSE indicates failure.

JS_ValueToUCString()

Description

This function extracts a function argument from a JSVal structure, converts it to a string if possible, and passes the

converted value back to the caller.

Note: Do not modify the returned buffer pointer. It can corrupt the data structures of the JavaScript interpreter. To

change the string, copy the characters into another buffer and create a JavaScript string.

Arguments

JSContext *cx, JSVal v, unsigned int *pLength

• The *cx argument is the opaque JSContext pointer that passes to the JavaScript function.

• The v argument is the JSVal structure from which Dreamweaver extracts the string.

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Adobe Extending Dreamweaver CS4 Manuale Utente Pagina 358